Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A mobile station communicating with a radio base station, comprising: a parameter acquisition unit configured to acquire a discontinuous reception state parameter and a non-discontinuous reception state parameter from the radio base station; a synchronization state determination unit configured to determine a downlink synchronization state, based on a radio quality of a serving cell for the mobile station; a radio link failure state determination unit configured to determine whether or not the mobile station is in a radio link failure state, based on a determination result by the synchronization state determination unit; and a connection re-establishment unit configured to re-establish a connection with the radio base station, when the radio link failure state determination unit determines that the mobile station is in the radio link failure state, wherein the radio link failure state determination unit determines whether or not the mobile station is in the radio link failure state, based on the downlink synchronization state determined by the synchronization state determination unit and the discontinuous reception state parameter acquired by the parameter acquisition unit, when the mobile station is in a discontinuous reception state; and the radio link failure state determination unit determines whether or not the mobile station is in the radio link failure state, based on the downlink synchronization state determined by the synchronization state determination unit and the non-discontinuous reception state parameter acquired by the parameter acquisition unit, when the mobile station is not in the discontinuous reception state, wherein the discontinuous reception state includes reception states for receiving signals and non-reception states for not receiving signals that are set alternately and repeatedly.
A mobile phone communicates with a cell tower. The phone gets two sets of parameters from the tower: one for when the phone is in discontinuous reception (DRX) mode (alternating between active and inactive states) and one for when it's not. The phone also determines the quality of the signal from the tower. If the signal is bad, and the phone is in DRX mode, it checks the signal quality against the DRX parameters. If the signal is bad and the phone is not in DRX mode, it checks the signal quality against the non-DRX parameters. If the signal is determined to be too poor based on the applicable parameters, the phone tries to reconnect to the cell tower.
2. The mobile station according to claim 1 , wherein the radio link failure state determination unit is configured to activate a timer, when an asynchronous state of the downlink synchronization state continues for a first predetermined period or more, and to determine that the mobile station is in the radio link failure state at a time at which the timer expires; and the discontinuous reception state parameter and the non-discontinuous reception state parameter include at least one of a first parameter for defining the first predetermined period and a second parameter for defining the timer.
This mobile phone figures out it's lost its connection to the network if its signal is bad for a certain amount of time, using a timer to keep track; the phone can adjust how long it waits based on settings related to how often it usually checks for a signal.
3. The mobile station according to claim 2 , wherein the radio link failure state determination unit is configured to stop the timer, when the synchronous state of the downlink synchronization state continues for a second predetermined period or more in a state where the timer activates; and the discontinuous reception state parameter and the non-discontinuous reception state parameter include a third parameter for defining the second predetermined period.
The mobile phone from Claim 2 stops the timer if the downlink signal quality becomes good again for a specified period while the timer is running. The DRX and non-DRX parameters from Claims 1 and 2 include a value that defines how long the signal must be good to stop the timer. This prevents unnecessary reconnections if the signal improves before the timer expires, optimizing the phone's radio link failure detection.
4. A radio base station communicating with a mobile station, comprising: a parameter notification unit configured to notify, to the mobile station, a discontinuous reception state parameter and a non-discontinuous reception state parameter; wherein the mobile station determines whether or not the mobile station in a discontinuous reception state is in a radio link failure state based on the discontinuous reception state parameter and a downlink synchronization state; and the mobile station determines whether or not the mobile station in a non-discontinuous reception state is in the radio link failure state based on the non-discontinuous reception state parameter and the downlink synchronization state, wherein the discontinuous reception state includes reception states for receiving signals and non-reception states for not receiving signals that are set alternately and repeatedly.
A cell tower communicates with a mobile phone and transmits two sets of parameters to the phone. One set is for when the phone uses discontinuous reception (DRX), alternating between active and inactive states, and the other is for when it's not in DRX. The phone uses the DRX parameters to decide if a radio link failure occurred when in DRX mode, based on downlink signal quality. The phone uses the non-DRX parameters to decide if a radio link failure occurred when not in DRX mode, also based on downlink signal quality.
5. The radio base station according to claim 4 , wherein a timer is configured to be activated in the mobile station, when an asynchronous state of the downlink synchronization state continues for a first predetermined period or more, and the mobile station determines that the mobile station is in the radio link failure state at a time at which the timer expires; and the discontinuous reception state parameter and the non-discontinuous reception state parameter include at least one of a first parameter for defining the first predetermined period and a second parameter for defining the timer.
The cell tower described above transmits parameters to the mobile phone that are used to start a timer. This timer is started when the downlink signal quality remains poor for a set amount of time. If the timer expires, the mobile phone determines there is a radio link failure. The DRX and non-DRX parameters from Claim 4 include values that define how long the signal must be bad before the timer starts and the length of the timer itself.
6. The radio base station according to claim 5 , wherein the timer is configured to be stopped in the mobile station, when the synchronous state of the downlink synchronization state continues for a second predetermined period or more in a state where the timer activates; and the discontinuous reception state parameter and the non-discontinuous reception state parameter include a third parameter for defining the second predetermined period.
The cell tower described above transmits parameters that, when the signal quality improves for a set amount of time, stop a running timer in the mobile phone. This timer was started due to poor signal quality, as described in Claim 5. The DRX and non-DRX parameters from Claims 4 and 5 include a value that defines how long the signal must be good to stop the timer.
7. A mobile communication method of performing communication between a radio base station and a mobile station, comprising the steps of: (A) notifying, from the radio base station to the mobile station, a discontinuous reception state parameter and a non-discontinuous reception state parameter; (B) determining, at the mobile station, a downlink synchronization state based on a radio quality of a serving cell for the mobile station; (C) determining, at the mobile station, whether or not the mobile station is in a radio link failure state, based on the downlink synchronization state, the discontinuous reception state parameter, and the non-discontinuous reception state parameter; and (D) re-establishing, at the mobile station, a connection with the radio base station, when the mobile station determines that the mobile station is in the radio link failure state; wherein in the step (C), the mobile station determines whether or not the mobile station is in the radio link failure state, based on the downlink synchronization state and the acquired discontinuous reception state parameter, when the mobile station is in the discontinuous reception state; and in the step (C), the mobile station determines whether or not the mobile station is in the radio link failure state, based on the downlink synchronization state and the acquired non-discontinuous reception state parameter, when the mobile station is not in the discontinuous reception state, wherein the discontinuous reception state includes reception states for receiving signals and non-reception states for not receiving signals that are set alternately and repeatedly.
A method for communication between a cell tower and a mobile phone involves the cell tower sending two sets of parameters to the phone: one for discontinuous reception (DRX) and one for non-DRX. The phone measures the quality of the signal from the tower. Based on this signal quality, the DRX parameters (if in DRX mode), and the non-DRX parameters (if not in DRX mode), the phone decides if a radio link failure occurred. If a failure is detected, the phone attempts to reconnect to the tower. DRX involves alternating between active and inactive states for signal reception.
Unknown
August 5, 2014
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